Nicki Blackmore, who was days away from her 18th birthday at the time, said in a police statement that she had met Jermaine Lindsay, 19, just over two weeks before he killed 26 people at King's Cross in 2005.

He was already married to Samantha Lewthwaite, then 21, who was pregnant with their second child. Miss Blackmore told police they met at a boxing club in Aylesbury, Bucks. He introduced himself as "Tyrone"and later took her for a walk around a lake.

"We talked about jobs, friends, family and school and he told me that he worked for his father, writing songs," she said.

"At midnight he dropped me home. Twenty minutes later he texted me and asked if I wanted to start a relationship."

The following day, Lindsay took her shopping in Milton Keynes and told her on the way back that he needed a gun as he was going to London with friends to teach some people a lesson. "He said it was something to do with drugs."

She told police he gave her poems which had a "positive message about al-Qaeda and the Islamic faith". During another shopping trip on June 25, he became agitated after receiving a phone call. The inquest was told that Mohammed Sidique Khan, the plot's leader, had called Pakistan and then rung Lindsay.

"He said that he needed to prepare himself. I asked him what did he need to prepare himself for, and he said 'shooting the people who need to be taught a lesson in London'."

Miss Blackmore said: "I texted him [on July 2] and said I did not want to lose him because I had started to have feelings for him." He texted back to say: "I don't want to lose you either, you are my Cheeky Princess."

On July 5, Lindsay told her: "I love you more than you can imagine, I want to stay with you for ever." He then asked her to stay in London with him the following evening. He called at midday on July 6 to check she was still coming but she later told him she had changed her mind.

He said: "Come on it will be nice, we can spend some quality time together. Let's order some bad boy room service."

Instead, she asked if he would come to her birthday party on July 14 and he replied: "I might be around, then again I might not."

She did not hear from him again until she saw his picture on July 17 in connection with the bombings. She said they had no sexual contact and she had not known he was married or had a child.